Table 6 Estimated coefficients for real and codified values of independent variables (inhibitors) were fixed by applying the fractionated factorial design 25−2
Variables (mmol/L) | Symbols | Values and ranges (mmol/L) | |
|---|---|---|---|
(− 1) | (+ 1) | ||
Acetic acid | X 1 | 5.0 | 20.0 |
Formic acid | X 2 | 5.0 | 15.0 |
Levulinic acid | X 3 | 10.0 | 35.0 |
Furfural | X 4 | 10.0 | 30.0 |
Vanillin | X 5 | 5.0 | 10.0 |